In a filing to the Office of the US Trade Representative the major movie studios describe how successful the shutdown of Megaupload has been. According to the MPAA the file-hosting industry was massively disrupted, with carry-over effects to linking and BitTorrent sites. Nonetheless, the movie group says the work is not done yet and lists The Pirate Bay, Extratorrent, isoHunt, Kat.ph and several other file-hosting and linking sites as remaining threats.